Arc length control study for crawl-type electrogas arc welding robot

摘要

Electrogas arc welding(EGW) is an important method for vertical position welding;the quality of welding product is highly depended on its welding arc length stabiliy,so there is a necessity of arc length control for EGW.Based on crawl type arc-welding robot,this article studies the variation of the arc length during the welding,and brings up a two-level linkage arc length control system composed by a slider and the welling vehicle.The advantage of the slider in dynamic response gives the system a good performance of fast and high precision arc length control.By controlling the vehicle travel speed,the slider always stays in its neutral position,which makes the system maintains the ability of widest range adjustment.This system has an wide-range adjustment,high dynamic response and high precision as well.